How to cut a thread

How to cut a thread with a tap

We cut the thread with a tap. The most basic and common option for fastening parts is a threaded connection. It would seem that making it yourself would not be difficult. In fact, correct cutting of a thread with a tap requires compliance with many rules, otherwise a high-quality connection will not be possible in the future, or even the thread will not succeed at all or the tool used will become unusable. How to cut a thread with a tap yourself.

Tool selection

Poor quality tools mean poor quality work. Using old, dull or rusty taps or dies is fraught with the risk of them breaking during operation and poor threading on the part. In addition to tools that have been unusable for a long time, you should also avoid those that were unsuitable from the very beginning. These include all cheap options of unknown origin.

In addition to quality, their size is also important, namely the ratio of the sizes of the drill used and the hole for it. You can calculate the necessary parameters using the formula, but to facilitate this process, examples with exact ratios are given:

• metric thread M2 – drill (tap) diameter 1.6 mm;
• m.r. M2.5 – d.s. 2.2 mm;
• m.r. M3 – d.s. 2.5 mm;
• m.r. M4 – d.s. 3.3 mm;
• m.r. M5 – d.s. 4.2 mm;
• m.r. M6 – d.s. 5 mm;
• m.r. M8 – d.s. 6.7 mm;
• m.r. M10 – d.s. 8.3 mm.

Parts lubrication

This point is very important, because thanks to it the tool used will last many times longer. In addition, it reduces the likelihood of drill breakage inside the hole and reduces the temperature of the heated edges of the tap. But when choosing a lubricant, you must take into account the material of the parts on which the thread is applied:

• steel, brass – linseed oil;
• aluminum - kerosene;
• copper - turpentine;
• bronze, cast iron - without the use of coolant (cutting fluid).

It is not recommended to use mineral or machine oils as a lubricant. Their composition does not allow the surface of the tap or die to glide smoothly, so the thread will be rough.

How to Tap a Thread: Internal Threading

The main nuances have already been discussed; now you can go directly to how to cut a thread with a tap or die. The process looks like this step by step:

We clamp the workpiece in a vice.

We drill a hole for further cutting of the internal thread.

Using a drill whose diameter is several millimeters larger than the planned thread, we apply a chamfer to the edge of the hole. It is necessary for easier insertion of the tap, as well as to facilitate the process of screwing the screw into the finished product.

We insert a rough tap into the driver (a device for fastening taps and dies).

Apply lubricant to the cutting part.

Insert the tap into the hole and make three turns.

After the first three revolutions, we make one revolution in the opposite direction. Thus, we break the chips resulting from the cutting process and they will not interfere with the high-quality and even application of the thread.

If the hole in the part is through, it is necessary to make sure that the front part of the tap comes out completely from the back side. Without doing this, we risk getting an unfinished thread.

Breakage of the cutting part of the tap in a blind hole

If the end of the broken part is completely “recessed” in the hole, it will be very difficult to get it out. But if you have some patience, it’s still possible to do this. You will need paraffin, an oblong and thin wooden stick, and nitric acid. Lubricate the workpiece with paraffin (protect it from acid). We moisten the end of the stick with acid, insert it into the hole and lubricate the cutting edges of the metric. How to cut a thread with a tap

It is necessary to continue the procedure until the edges begin to melt. After this, the fragment is either knocked out with a hammer from the back of the part, or picked out with tweezers.

How to cut threads with a estimator: cutting external threads

Having taken the necessary part, we clamp it in a vice. We make a small chamfer on one side with a file, lubricate this side with oil, kerosene or turpentine (depending on the material).

We insert and fix the die into the die holder. We place the die to the desired end of the pipe and slowly rotate it in the direction we need with one hand, with the other hand we make sure to press the top of the die to the pipe.

When the die is firmly seated on the pipe, check that it is perpendicular to the pipe, grab the die holder with both hands and make 3-4 turns forward, and then half a turn back.

When cutting external threads, there is one caveat: during the last turns, do not rotate backwards, this will allow the nut to be firmly fixed on the pipe.

Please note that freshly cut threads should not be touched with bare hands; they may have very sharp burrs and there is a high risk of cutting.

Noteworthy information : Threading die , How to attach an anchor bolt

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Source: https://stroitelinfo.ru/kak-narezat-rezbu-metchikom/

How to cut a thread on a pipe: an overview of the main methods - Engineer's Advice

Even many experienced locksmiths have no idea what a clamp is, not to mention ordinary people. And this tool can help you out a lot when laying a home pipeline. We will talk about how he can do this in this article.

Pipe clamp 1-1 2-1/4-3/8-3/4 with ratchet and in a plastic container

General provisions

Let's start, perhaps, with the function performed by the clamp - thread cutting. You can rightly argue that the appearance of plastic pipes in everyday life has made the use of threaded connections unclaimed. Thus, polyethylene products are connected with special fittings for sewer pipes, while polypropylene products are simply welded.

Photos of plastic pipe connections using fittings

But things are not so simple when it comes to reliability. To better understand what we are talking about, let's take a look at the disadvantages of polyethylene and polypropylene:

Disadvantages of using plastic pipes

• Limitation of temperature conditions . For polypropylene the limit is 95 °C, and for polyethylene – 40 °C. In our harsh winters, there are situations when the boiler room has to supply water that exceeds technical standards, which will undoubtedly lead to an accident. So it is very risky to use this type of pipe for a heating system.
• Weak resistance to mechanical stress . This immediately eliminates the possibility of laying a plastic water pipeline under the roadway, since it will simply be crushed over time. And in places open to contact, you will also have to be careful, remembering the vulnerability of this material.

Polypropylene pipe cracked under load

But metal is not afraid of either high temperatures or excessive mechanical loads. But even with him in the matter of connection, not everything is so simple:

Types of steel pipe connections

Advice: it is recommended to use exclusively galvanized products to prevent destructive corrosion processes and rust from entering the pipeline.

Galvanized pipes for water supply system

Type of connection	Advantages	Flaws
Welding	Completely sealed	Deterioration of the zinc layer, as a result of which the pipeline becomes vulnerable to corrosion processes
Thread	Possibility of dismantling	The need to use additional seals to achieve optimal sealing

Using tow to eliminate a possible leak is not as dangerous as damaging the coating that protects against rust. In addition, not everyone knows how to use a welding machine with their own hands. Also important is the possibility of maintenance, which is very problematic with a solid line. So the threaded connection wins by a clear margin.

Manual pipe threading die with convenient holder

Of course, a lathe is ideal for cutting threads, but there are many problems associated with its use, the most important of which is its absence. So what remains is a die or die.

Definition

Professional set of clamps for pipe work

If the die has the form of a small cylinder made of high-quality tool steel with cutters and grooves for chips located inside, and holes for fixing holders on the outside, then a die is just cutters with a holder mechanism that simplifies the work.

Thus, despite the fact that the price of the die may be higher than the die, as a result you still save. Since in it expensive material is used only for the working consumable part, and the die consists entirely of it and is thrown away after it is used up.

Kinds

A set of pipe clamps and additional plumbing tools

Clupp name	Description
Simple manual	A ring with clamps for cutters and handles, which looks very similar to a regular die
Manual with ratchet	A ratchet has been added to the ring, allowing you to use the tool with one hand.
Electric	In this case, all the instructions boil down to fixing the pipe in the appropriate groove, the electric drive will do the rest for you

Advice: when choosing between a simple tool and one equipped with a ratchet, it is recommended to choose the first one, as it is much more reliable and practical.

Model KTT-1 4-1-1 2 2 with ratchet

Terms of use

Cutting threads on a pipe with a clamp at home

Now let's figure out how to use a pipe clamp.

To do this, it will be enough to follow a few rules:

• Before cutting a thread on a pipe with a clamp, it must be rolled by turning with a file, crimping with a gas wrench, or by any other available method.
• Lubricate the cutting area with grease - this will improve the quality of the cut threads and extend the service life of the cutters themselves.
• When purchasing new cutters, check with the manufacturer of the holder. Otherwise, they simply may not fit tightly into the grooves.
• When working on the pipe end of an existing pipeline, hold it with a gas wrench so as not to tear it off.

Conclusion

Despite the fact that today plastic sewer pipes are very popular due to their low cost and ease of processing, metal ones remain more practical and reliable. The best connection for them is a threaded one, which in turn is most convenient to cut with a screw. The types and features of such a tool are described above.

Pipe cutting die equipped with an electric drive

This article will introduce you to additional materials. Use the most convenient tools for working with plumbing!

Source: https://sovingener.ru/kak-narezat-rezbu-na-trube-obzor-osnovnyx-sposobov.html

How and with what to cut a thread on a pipe with your own hands: tools, methods and types of threads

A threaded connection is the most convenient for installing plumbing communications. Its strength indicators are lower compared to welding. But, if you need to replace the pipe, just unscrew the nut and gain access to the entire system.

Most pipes come off the assembly line without a threaded joint. In this case, pipe threads can be cut yourself.

What will be needed for work

In industry, machine equipment is used for cutting, which, without the presence of a driver, copes with centering, moving the die, and subsequent finishing. In an apartment or garage, this is an impossible task.

A special cutting tool is suitable for home use, which can be bought at any hardware store or market. It is presented in the form of collapsible or solid dies and taps.

In addition to the clamp and dies, you will also need an additional tool:

• Pipe cutter A tool designed for cutting steel tubes. Equipped with multiple rollers and a carbide or diamond cutter. Gives a thin, almost imperceptible cut, without burrs. If you don’t have one, you can use a grinder with a cutting wheel. Burrs and irregularities appear on the cut that need to be processed.
• File or flap circle. If surface defects appear after cutting, additional processing will be required. Since the steel in pipes is raw and soft, it is easy to sharpen it with a file or needle file. To speed up the process, you can use an angle grinder.
• Gas burner or hair dryer. If you have to work with an old pipeline, you will have to remove paint and rust. Threading pipes with paint will not provide a tight grip or strength. Old paintwork, most often oil-based, can be easily cleaned with heat. Use a gas torch or hairdryer to walk over the surface and clean everything off with a spatula. Other types of paint require chemical removal. For this purpose, special removers and rust converters are used.

• Vise. Since you have to put a lot of effort into cutting, they need to be fixed. It is best to use a plumbing press that has a special jaw profile. But, you can also use a regular bench vise.
• Key. If you have to do repairs “on site”, the vice will not work there. In this case, you will need a gas key. It has a large distance between the jaws and allows you to firmly fix the pipe.
• Oil. It is advisable to lubricate the part so that it moves along the thread more easily. In this case, you will need a lubricant such as machine oil, WD-40, household grease or petroleum jelly.
• Rags. After cutting, it is imperative to remove all dirt from the thread, so after work it is wiped with a rag.

Cutting external threads with a solid die

How to cut threads on a pipe? For this, a special tool is used - a die.

A die is a metal disk consisting of two groups of holes: internal and external (petal).

The internal ones have a threaded notch, which creates slits in the metal. In expensive versions, the threads are made of carbide or coated with diamond coating. Thanks to this, you can even cut through knee steel. But most pipes are made from raw low-carbon ferrous metal. It can be cut with ordinary hardened metal.

Flap holes are designed to drain chips. Since the grooves can be deeper than 1 millimeter, there is a lot of waste that needs to be removed to avoid clogging the cutters.

For low-carbon steel grades, quick-cut dies are suitable. They are harder than the average metal in pipes. For stainless steel water pipes, you will need pobedit water pipes.

As a rule, one strip has from 8 to 10 turns. They are arranged in the shape of a cone. This is required in order to start cutting simply using shallower turns. But the height differences are too small and do not disturb the thread.

Some sets contain several planks of the same size. This is required for roughing and finishing cutting.

A die for cutting threads on pipes can be:

1. Whole. They have high accuracy since the disk is closed. The absence of movement of the coils prevents the cutting from going astray. But due to solidity, there is a drawback - rapid wear of the cutters.
2. Separate. They have a slot from the border of the disk to its center. They are used where high precision is not needed, since the groove causes radial movements during operation. Since they have little cushioning, they wear out less.

For convenient rotation, a special knob is used. It has a connector for installing a die and locking screws. Handles are located horizontally for uniform pressure and rotation.

Die cutting process:

1. The tube is being prepared. It needs to be cut to the required length, the end processed, paint and rust removed.
2. The tube is fixed in a vice or gas wrench. The die is installed perpendicular to the widened side of the cone. Careful rotations with pressure cut the thread.
3. The prepared turns are cleaned with a rag. If oil was used, you need to use a solvent.

Using a die with a ratchet holder

The cutting task is greatly simplified if you use ratchet handles. This is a single handle design.

The body itself consists of four parts:

1. The die itself is installed below. It is fixed with clamping bolts.
2. In the middle there is a ratchet, to which a handle is welded. A little higher is a switch for switching motion.
3. A center finder is built into the top.

This design is especially convenient if space is limited and it is not suitable for a two-handed crank. The ratchet allows you to cut with greater comfort. By placing the switch in the screw position, a metal cut occurs. By turning the lever back, the switch is activated and the die does not move.

Below is a video about how the ratchet wrench works.

Application of die dies

A die for cutting threads on pipes is a universal tool, sometimes called a collapsible die. To prepare the work you need:

1. Install the cutters into their seats. They can be included or purchased separately.
2. After installing the taps, they are sealed on top with special metal plates.
3. The head is fixed with screws and the die is ready for use.

The collapsible type of thread cutting tool has high maneuverability, copes well with increased loads and is easy to carry. They are often bought in a set that contains all the necessary cutters.

Thread cutting using a clamp

In the standard set, the die consists of several heads with cutters and a rod for transmitting torque.

The cutting process is simple and does not differ from standard dies. The cutters are cone-shaped, so there are no problems with entering the pipe.

It is advisable to follow several rules for working with a clamp:

1. Lubrication. For normal cutting you need to use oil or lubricant. To easily remove chips, it is better to use solid oil or other thick liquids that can easily capture metal scraps.
2. Center. It is important that the alignment is not knocked down. Since cutters are much harder than pipes, it is easy to bevel the thread, causing the thread to become unusable.
3. Change of rotations. Every half turn, you need to turn the lever back a little.

What about internal threads in pipes?

It was described above how to cut a thread on a pipe. With an internal cut everything is a little different. In a standard pipeline, this is not accepted. Usually, swivel connections are used, since twisting inward will narrow the water supply. This can lead to clogging with metals and minerals.

Sometimes it is difficult to find adapters for the drive in stores, so it has to be made by hand. Taps are used for this. From the outside, they look like bolts, but they have segmented cutters rather than solid ones.

Often sold in pairs, for finishing and roughing work. They are much simpler to work with. They can be done manually using a wrench or a screwdriver.

There is no need to process the hole or remove burrs, but it is advisable to lubricate it.

Types of threads

At the moment, there are several standards for threaded connections used in plumbing. Before cutting threads on a pipe, you need to inquire about their sizes and types.

Two types of threads may not connect to each other, since the angle between the vertices, their length and height will not allow them to fit comfortably.

Metric thread

The name is due to the fact that the measurement takes place in millimeters and the dimensions are indicated in conventional units. The edge has the shape of an equilateral triangle.

In Eurasia this is the most common profile. It is considered a standard, since most plumbing connections are equipped with a metric. Almost all tools for cutting threads on pipes are sharpened specifically for it.

G Straight pipe thread

Cylindrical notching is regulated by GOST 6357-81. Has an inch profile and pitch, common in the USA. If you need to connect the pipeline to American plumbing equipment, you need a special adapter or pipe cutting to profile G.

The letter designation is conventional and indicates the pipe passage in inches.

R pipe tapered thread

Inch pitch pipe with a 1:16 taper. The designation of internal thread is Rc, external thread is R.

Other pipe thread standards

In addition to the categories described above, other sizes will be needed to work with plumbing fixtures.

In some cases, adapters or tools with rare dimensions may be required. These include:

1. Inch. The measurement takes place in non-metric units (English imperial measure). One inch is equal to 0.0224 meters. This can be determined by the double quotation marks after the number (1” – 2.54 centimeters). The measure differs from the metric system, so an adapter is needed to fit two types of threads.
2. Round. Some types of sanitary fittings are equipped with a round notch. These are various types of shut-off elements, mixers and taps.
3. Trapezoidal. Thread with trapezoidal cross-section and an angle of 30 degrees.

Source: https://kakpravilnosdelat.ru/kak-narezat-rezbu-na-trube-svoimi-rukami-obzor-osnovnyh-sposobov/

How to cut a new thread

Hello, dear readers and blog visitors. Let me remind you that in the last article we discussed the role of a standard sheet of drywall in construction. And today I want to look at how to cut a thread on a workpiece. Do you think this is off topic? In vain. And one day you will see this. Well, let's not get distracted. Let's get started.

Preparation of materials and tools

Depending on the nature of the location of the thread on the workpiece, it can be either internal or external .

The devices and tools used to make external and internal threads differ from each other.

Special taps are used to make internal threads . They are usually sold in sets; each tap has two options (rough and finishing). Certain types of taps may have three (rough, mediocre and finishing).

Wrenches are used to turn the tap while cutting the thread. There are several types of gates based on their design.

The simplest is considered to be a windowed driver - a metal die with several windows for the tap shank of different sizes.

A split driver is more convenient because it has two diverging parts and can grip tap shanks of quite different sizes.

Collet drivers (included with a removable lever) are designed for a modest range of tap diameters. Its advantage is that it can cut threads into holes and recesses that conventional wrenches cannot reach.

In construction markets you can also find combined taps for cutting, already with a driver. However, they are in little demand, since working with them is not very convenient.

To make external threads, so-called thread cutting dies are used. They can be round ( lerks ) and sliding (prismatic dies).

Lerki, or round dies, can be split or solid. Template diameters of round dies for external threading are from 1/8 to 2 inches, or from 1 to 26 mm.

When cutting external threads, both sliding dies and dies are installed in a special driver (die holder). To do this, you first need to unscrew the fixing screws from the knob. Place the die in the driver and secure it with screws.

When placing the die in the driver, make sure that it is evenly positioned in the grooves: the plane of the die should be parallel to the plane of the die holder driver. When fixing the threading die, the screws must fit into the recesses located on the body.

Preparation of the workpiece

Before cutting an internal thread, it is worth drilling a hole at the intended location of the thread, slightly smaller than the diameter of the tap.

Clamp the workpiece with the drilled hole in a vice. Go first with a rough tap (in some cases you should go through it several times with a rough tap), then with a finishing tap.

Before you start cutting external threads, secure the workpiece in a regular vice and use a file to remove a small chamfer from the edges of the workpiece where the threads will be made.

Internal thread cutting

Place a roughing tap of the required diameter in the driver and start cutting. During the process, pay attention to the location: the tap must be strictly perpendicular to the plane of the workpiece .

After a few turns, go back and remove the metal shavings and filings from the hole. Such actions should be repeated several times without resorting to much effort. The thread tap is quite fragile and with great force can break and remain inside. It will take a lot of effort to remove it. But even if you remove it, the thread will be damaged - the workpiece will be thrown away.

After passing through a rough thread tap, it should be changed to a mediocre or finishing one, repeating all of the above operations in the same sequence.

To facilitate the cutting process, the intended thread location should be lubricated with regular machine oil or a special “liquid wrench” product.

External thread cutting

We place a die on the end of the workpiece with the previously chamfered. Then we begin to make several turns with the crank. The die with the knob should rotate clearly horizontally, without distortions.

With large diameters (such as on water pipes), considerable physical strength will be required. Movements, as with internal threading, should be carried out: 2-3 turns forward, 1-2 back. This will make the thread cutting process easier, and at the same time clean the die and threads from metal shavings and filings. To speed up and make it easier, the threads can also be lubricated with machine oil .

A well-cut thread should not contain breaks in the thread. Its cutting should proceed without any difficulty in rotation or jamming of the die.

Sealing of threaded connections

You can achieve optimal sealing of threaded connections (water and other types of pipes) using a special FUM tape or tow.

Nowadays, FUM tape . This is an ordinary strip of fluoroplastic, which is wound tightly onto the thread in several layers. Due to its small thickness, it lies flat on the thread and reliably seals threaded connections. In addition, FUM tape is most resistant to the influence of liquids of almost any temperature.

FUM tape can also be used for sealing threaded connections on gas pipelines. She, unlike tow, does not leave behind waste.

Tow is a reliable material that has been proven over many years and ensures a long-term tight seal of threaded connections. Once the threaded connections are sealed, separate a rag of the required length and thickness and wrap it in an even layer around the threads.

This is where I will finish the article about threading. I also consider it mandatory to know safety precautions when working with metal, so I devote the next article to this topic. Good luck and blessings to everyone.

Source: http://odnastroyka.ru/kak-narezat-rezbu/

How to cut threads on a pipe with your own hands

When performing work related to the installation of plumbing or heating, it becomes necessary to cut threads on pipes. To do this, you can take a pipe and head to the metal rolling mill, where the threads will be cut in a matter of minutes. However, this method has not been relevant for a long time, since there are other options that do not require transporting the pipe to production.

Existing threading options

Pipe threads are divided into five types, but the most popular options are conical and cylindrical. Household members often encounter such types of pipe threads. There are two methods for threading a water pipe:

• Automatic, which involves cutting threads on water supply pipes using special machines and power tools.
• Manual. For this, special hand tools are used.

If, as part of his job, a person needs to cut threads on a large number of pipes, then it is appropriate to purchase a special power tool, which will facilitate manual labor.

When the need to obtain a threaded connection is an isolated case, then manual technology is suitable for such purposes. On water pipelines, as well as pipes of heating systems, thread cutting is performed using a die.

A die (another name for a die) is the simplest device intended for cutting external threaded connections on pipes.

The die is a steel disk, and its inner diameter has axial holes in different numbers, which depends on the size of the product. The edges of these holes form cutters, with the help of which thread cutting is performed. To ensure the reliability of such a tool, it is made of alloy steel or hard alloys.

Dies can have different shapes (round, square, hexagonal or prismatic), but most often disc options are used. Disc dies are intended for making threaded connections on water pipes. To make it convenient to work with the die, they are equipped with additional knobs, as well as clamps in the form of screws. Dies are also solid, split and sliding.

Solid dies for threading pipes have one significant drawback - rapid wear of the cutters. This is due to the rigidity of the product’s own design. Split or spring-loaded dies have a less rigid design, which significantly increases the service life of the product.

Due to the spring-loaded mechanism, such a tool for cutting threads on pipes allows you to vary the diameter of the resulting threaded connections in the range from 0.1 to 0.3 mm. A device of this type is highly resistant to cutter wear, but is not capable of providing high accuracy.

Sliding dies are 2 working parts intended for installation in a mounting module. A die with a special fastening module forms a tool called a pipe clamp. The die is fixed in the die using a cracker and an adjusting screw. It is with the help of the adjusting screw that the thread diameter is adjusted.

Typically, pipe clamps are supplied complete with dies of various diameters. Having such a set, you can always cut threads on a pipe of any diameter.

How to cut a thread on a pipe with your own hands

To make threading on a pipe with your own hands, you initially need to perform a number of preparatory measures:

1. Carefully clean the tube in the area where you plan to get the threads.
2. Clean the end part of the product with a file.
3. Lubricate the working area to reduce resistance.

In order for the thread cutting process to be convenient and the end result to meet the requirements, before carrying out the action you need to secure the product in a vice. This will allow you to fix the part so that you can perform the necessary actions with both hands. After this, the following actions are carried out:

1. A wrench with a die of the required diameter is used, with the help of which a rough pass is carried out. In this case, it is important to keep the die strictly perpendicular to the pipe.
2. The roughing pass is the basis of thread cutting, so do not rush and perform the actions slowly but efficiently.
3. A rough cut allows you to get 2-3 threads of thread. This is exactly how many threads are needed for the tool to take a secure position.
4. The next step is to twist the rough die and use the finishing die. With its help, the required number of threads is cut on a pipe that is planned to be installed in a water supply or heating system.
5. After each pass, you need to make 0.5 turns back to clear the cutting area from chips.
6. At the final stage, you should use the third die, which carries out a control pass.

When threading, it is important that all actions are performed slowly, and with each subsequent turn the cut area is cleared of metal shavings.

How to cut threads on a pipe near a wall

Often thread cutting needs to be done on site when the pipeline is fixed in one part to the water supply or heating system. In hard-to-reach places, it is impossible to cut threads on a pipeline installed near a wall using a die and a wrench. For such purposes, you will need to use a thread-cutting device such as a clamp with a ratchet. With its help, the thread cutting process is simplified several times.

The procedure for thread cutting with a manual die is carried out as follows:

1. A nozzle of the appropriate diameter is fixed in the clamp mount, after which you can begin the procedure itself.
2. The surface of the pipe - the working area - is cleaned.
3. The area to be cut must be cleaned until a metallic shine appears.
4. A chamfer is made at an angle of 45-60 degrees.
5. The material is lubricated with Litol or Solidol.
6. The key is placed on the working area of ​​the pipe.
7. Moderate back-and-forth rotations of the instrument are performed.

As with a die, when working with a die, you need to make half a turn back after each new thread to remove the metal edge. To facilitate the threading process, you can use an electric die, but it is rational to purchase such a tool only if you need to use it every day.

On pipes you can cut not only external but also internal threads, for which taps are used. However, the need to obtain threads on the inside of the pipeline arises only in rare cases. Knowing the features of self-threading, you will never have problems with the installation of water supply and heating systems.

Source: https://gidpotrubam.ru/montazh-i-remont/narezat-rezbu-na-trube